We now have KD_FONT_OP_SET_TALL, but in fact such large fonts cannot be loaded. No console driver supports tall fonts. Unfortunately, userspace cannot distinguish the lack of support in the driver from errors in the font itself. In all cases, EINVAL will be returned. In order not to hack the KDFONTOP interface, I suggest adding a new ioctl to obtain information about the capabilities of the console driver. This is the second version of the patch with the fixes pointed out by Jiri Slaby. Previous version: https://lore.kernel.org/all/cover.1708011391.git.legion@xxxxxxxxxx/ --- Alexey Gladkov (5): VT: Add KD_FONT_OP_GET_INFO operation newport_con: Allow to get max font width and height sticon: Allow to get max font width and height vgacon: Allow to get max font width and height fbcon: Allow to get max font width and height drivers/tty/vt/vt.c | 24 ++++++++++++++++++++++++ drivers/tty/vt/vt_ioctl.c | 12 ++++++++++++ drivers/video/console/newport_con.c | 21 +++++++++++++++++---- drivers/video/console/sticon.c | 25 +++++++++++++++++++++++-- drivers/video/console/vgacon.c | 21 ++++++++++++++++++++- drivers/video/fbdev/core/fbcon.c | 22 +++++++++++++++++++++- include/linux/console.h | 2 ++ include/linux/vt_kern.h | 1 + include/uapi/linux/kd.h | 13 ++++++++++++- 9 files changed, 132 insertions(+), 9 deletions(-) -- 2.44.0
